Handgun for deer

I'm hunting a new area this year and moved my blind there permanently. I don't have the wide open space like before and out one side of the blind it's about 50 yards to the edge of the tree line. Couple times during hunts I've noticed the deer will come out of the tree line and it just won't work to get the ML up, so thinking about a handgun. Some of you guys who use handguns, what's some of your favorite calibers? I'll be sticking with a pistol and it doesn't have to be a double action and not looking at the top of the line out of my price range type pistol either.

Best bang for the buck is the Ruger Super Blackhawk Hunter - 7.5" SS revolver
- comes with scope rings which makes is so much cheaper and easier to add a scope if you ever decide to than having to buy a special base for a revolver.
- about $750
- we sell enough of them every year that i try to keep one in stock
- extremely accurate and well built (I'd avoid the cheap foreign 44 revolvers - there IS a difference)